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  • Title: Daily distribution of sleep states in the jackdaw, Corvus monedula.
    Author: Szymczak JT.
    Journal: Chronobiologia; 1986; 13(3):227-35. PubMed ID: 3792119.
    Abstract:
    Polygraphic and behavioral studies of the jackdaws Corvus monedula have revealed a strong influence of the natural day-night cycle on their daily wakefulness-sleep activity. The jackdaws were behaviorally active during the light part of the photoperiod. The daily distribution of slow wave sleep (SWS) was symmetric and that of paradoxical sleep (PS) was asymmetric. The amount of PS was greater in the second half of the night than in the first. Short and intermediate length episodes occurred almost homogeneously throughout the night. The longest sleep episodes clustered toward the middle part of the night and did not occur in the periods following onset of sleep and before the end of sleep.
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